:root {
  --bg: #0f172a;
  --panel: #111827;
  --muted: #94a3b8;
  --text: #e5e7eb;
  --accent: #22d3ee;
  --accent-2: #34d399;
  --danger: #f87171;
  --border: #1f2937;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(1200px 800px at 20% -10%, #0b1220, var(--bg));
  color: var(--text);
  display: grid;
  place-items: center;
  padding: 24px;
}

.app {
  width: 100%;
  max-width: 600px;
  background: var(--panel);
  padding: 24px;
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

header {
  display: flex;
  align-items: center;
  gap: 8px;
}
header h1 {
  margin: 0;
  font-size: 1.5rem;
}

.new-todo {
  display: flex;
  gap: 8px;
}
.new-todo input {
  flex: 1;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0f172a;
  color: var(--text);
}
.new-todo input:focus {
  outline: 2px solid var(--accent);
}
.new-todo button {
  padding: 8px 16px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #000;
  cursor: pointer;
  font-weight: bold;
}
.new-todo button:hover {
  background: var(--accent-2);
}

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.filters {
  display: flex;
  gap: 8px;
}
.filters button {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 12px;
  color: var(--text);
  cursor: pointer;
}
.filters button.active {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
}
.badge {
  font-size: 0.9rem;
  color: var(--muted);
}

#list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
#list li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: #1e293b;
  border-radius: 8px;
  border: 1px solid var(--border);
}
#list li.completed .title {
  text-decoration: line-through;
  color: var(--muted);
}
#list li input[type="checkbox"] {
  width: 18px;
  height: 18px;
}
#list li .title {
  flex: 1;
  outline: none;
}
#list li .todo-actions {
  display: flex;
  gap: 4px;
}
#list li .todo-actions button {
  background: var(--danger);
  border: none;
  border-radius: 6px;
  padding: 4px 8px;
  color: #fff;
  cursor: pointer;
  font-size: 0.8rem;
}
#list li .todo-actions button[data-action="edit"] {
  background: var(--accent-2);
  color: #000;
}
#list li .todo-actions button:hover {
  opacity: 0.8;
}

footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--muted);
}
footer button {
  background: none;
  border: none;
  color: var(--danger);
  cursor: pointer;
}
footer button:hover {
  text-decoration: underline;
}